Hello Tony,
Thanks for reaching out to us!
Have you tried using the GeoMashup plugin to see if it gives you the functionality that you’re looking for?
If that doesn’t quite fit, you could accomplish this with some custom development by using the Google Maps API and set markers based on the latitude and longitude metadata (“_VenueLat”, “_VenueLng” ) that is saved for each event with a venue defined.
I’m sorry I wasn’t able to give you a direct response however I hope these suggestions can point you in the right direction in getting the functionality you need set up.
Let me know if you’re able to get this set up how you’re wanting.
Thanks!